Expansion shield



J. KENNEDY.

EXPANSION SHIELD. APPLICATION FILED MAH.29|1919.

Patented Mar 21, 1922 2 SHEETS-SHEEN I.

III III IW HIH 6 m z m 2 w- 6 m j 4 i F i WM 45 INVENTOR W Z ATTORNEY J. KENNEDY. EXPANSION SHIELD.

v APPLICATION FILED MAR.29, I919- 1,410,258. Patented Mar. 21, 1922.

2 SHEETS SHEET 2.

JOSEPH KENNEDY, 0F. RIGHMGNID HILL, NEH/V YORK. ASSIGNOR TO JFEDWABD OGDEN, OF MOUNTAINVILLE, NEW YORK.

nxrensron SHIELD.

Specification 01 Letters Eat-cut.

Pultented Mar. 21, 1922.

To all 10/1/0777. it 772 ag concern Be it known that I, Josnrn KEJNEDY, a citizen of the United States of America, and a resident of Richmond Hill Queens County, and State of New York, have inv'cnted certain new and useful Improvements in Expansion Shields, of which the following 155 specification, reference being had to the accompanyingdrewings, hirining: s part thereof.

Tilly invention reletes to improvements in es'punsion shields which are designee to be used for bolt anchorages and to a new end useful. method of munu'hieturing such shields. More specifically, it relates to expansion shields which are made of sheet metal and to e method of making such shields oi sheet metal.

The object of this invention is to provide e. simple and inexpensive device which may he ell cotively used to hold a bolt or screw in i'ueteriel such as brick. stone or cement with which the threaded device cannot ohtuin. directly e secure hold.

Another object isto provide a. simple and inexpensive method of making such expzur siou shields.

in orderthst my invention may he thoroughly understood I will now proceed to describe the some in the following speci i ezition. and will then point out the novel '=.:=.turos thereof in appended claims.

in co- 'ieudiug applications :for patents which have matured, es Patents Nos. 1 ikhbfiifi. lilllels dlili and Mill-4 88?, dated 2?, i919. 1' have dies-hissed certeiu iu- .ndfliliw which i now belie are not udeue July cove; u the minimum gimtouis he reuse the eutions have heeu developed. in dii'l'e suggested in the the patents. and this application is u eoutiuuutiou 111 port of these applications.

li"l (3lil.l]11 to the drawings:

Figure l is an end VlOW of an expansion shield. which is made according. to and embodies the present invention. ihis figurc is the some as Figure 14 01"? said Patent No. 1,304,887. r

F igrure 2 is a side elevation of the device shown in Figure l. V Figure 5 is or side elevation of a. modified form of the device, shown in Figure 1. as

it appears when constructed with a tapered interior.

Figure 4 is view taken from one end. of the device shown in F in ure F igure 5 is a View taken from the other end of the device shown in Figure 3.

Figure 6 is a. plan View of 0. blank of sheet metal before it is bent to form the device of Figures 3, 4- and Figure 7 is on end View of a. blank similar to that shown in Figure 6 stamped or bent in a manner preliminary to e final bending which forms it into a tube.

F igure 8 is on end view of a. tube made from the bent stamping; shown in Figure 7.

Figure 9 is a side elevation of it ie tube or shield shown in Figure 8. t

Figure 10 is an end View of a shield similar to that shown in Figure 9 illus rating a modified fOlHLOf construction.

F igure 11 is a 718W corresponding); with" F igure 7 showing on end View of a bent hlenlr which is to be folded into a tub-chew ing' both inwardly and ouhvmrdly uroject iug ribs or folds.

Figiu'e 12 is a plan View of 21- hlonk Pol twisted in emnmnner which provides or the projecting ribs being interrupted or toothed as suggested on page 1,3()-...,885.

liigure i3 is an elevation oisn cxpzur;

sion shield mode from a blenl; like ti at shown in F'IQUL'O 1.2.

F io'u re 14 is u bottom plan riew of F igshown Figure 19 is a View of the shield shown in Figure 17 from the other end thereof.

Figure 20 is an elevation of the shield shown in Figure 17 taken at right angles to the View in the letter figure.

2, line 21 of Patent No. Y

Figure 21 is an elevation of the same dew form.

vice showing the opposite side to that shown in Figure 20. i

Figure 22 is an end elevation of a shield of modified form of construction which also embodies this invention. Figure 23 is a view similar to l igure which shows a shield of a still fin-their 1nodifloat-ion of construction.

Like characters of reference designate corresponding parts in all the figures.

25 designates a tubular shield which has been formed from a sheet metal blank, parts f hi h has been pinched together along parallel lines to form outwardly projecting ribs 26 of double thickness, rolled or folded transversely about a central axis into tubular form and with inwardly bent portions 27 adjacent the ribs 2-6. The longitiulinal edges of the blank are bent outwardly as shown at 28 and abut toform one of the outwardly projecting ribs near which are two of the in.- wardly projecting portions 27.

-For some purposes it is desirable to have the bore of the shield constricted in at least one of its transverse dimensions and a convenient way of accomplishing this result is shown in Figures 36. In these figures, 30 designates an undivided blank of arcuate This is arranged to be folded or pinched together. on the lines a n, 13-43 and C@ to form the portions between the" dotted lines cue-o2, bb. o-o into tapered ribs 31. The edges of the blank are folded.

outwardly at the line D-D and E-E and these parts when the tube is completed, form the rib 32. Adjacent to these ribs the metal of the blank is folded inwardly to. form the parts 38 which form the bore of the shield which tapers from one end of the shield to the other. The shield itself is. formed. as

shown by folding the metal transversely about a central axis.

It is to be noted that the exterior portions of this shieldlie in a cylinder. lhis cylinder is of approximately the diameter of the hole into which the device is inserted; ll hen a screw or bolt is forced into this shield the metal. will be expanded and there is an excess of metal at the end of this shield which will be at the inner end of the hole and this excess of metal. will become crowded about the screw or bolt to thereby effect a secure anchorage.

It is not necessary that the ribs project out validly but it is well within the scope of this invention. to have them project inwardly. A shield having inwardly project ing tapered ribs is shown in Figures 6 and 9. In these figures the ribs which are formed by pinching a part of the metal together are designated by 34; and the rib which is formed.

. he abutting edges of the metal, by in constructing this device the metallic blank is first stainpedinto some such form as that shown in F1gure 7 with a plurality of curved portions 36 with the "parts 37 between them pinched together in such a way as to form the rib 35 in the finished shield. The ends 38 are bent into such a form that when the shield is completed by folding the metal together they will. abut to form a rib such as that show-nat 35 in Figure 8.

it is not necessary that the ribs have but two thicknesses of metal. but they may be folded if desired, as shown in Figure 10, with portions lO--i1 lying against each other and other portions 42-- i=3 bent down over the portions -10 and 41 respectively, to thereby form ribs of four thicknesses. The rib shown at er has a similar number of thicknesses of metal, but is formed by the abutting edges of the blankas in the other cases. Either the inwardly projecting portions of the ribs in this Figure 10 or the outwardly projecting portions of the ribs, or both in wardly and outwardly projecting portions, may be tapered.

ll hen it is desired to have both inwardly and. outwardly projectingribs the blank may be first pressed in some such form as that shownin Figure 11 in which case the part designated by 45 will form an outwardly n'ojecting rib as will also the outwardly bent edges 46 of the blank and the parts 4r? will form inwardly projecting ribs.

in Figure 12 a blank 50 is shown which has the general arcuate form of that shown in Figure 6. In this case however, the blank is provided with a plurality of indentations at its edges and a plurality of perfora' tions 52 onlines F F, G -G, H-'-H, I-I, JJ, i':l and L-L, Which diverge or lie in a fan-like relation. These perforations may increase in width toward the lower end of the blank along some such lines as those indicated by the dotted lines f.-f.

The perforations on the lines G G, 1-1 and K-K lie on transverse spiral lines such as lit-M which pass through the center of two of the notches 51 on the edges of the blank and it is to be understood that the metal on these particular lines and on the edges of the blank is to bebent inwardly to form inwardly projectingribs. The perforations on the lines F-'F, H'H, J-J and IJ-:i J lie on spiral. lines such as lib-N which are intermediatethose of the perforations previously pointed out and the metal on erably so arranged that they lie in a helix of the same pitch as that of the screw which is to be used with this shield, so that the teeth 01"? the screw will readily engage with them. T he teeth 53 will lie in a helix of the same pitch but will be between the teeth on the inwardly projecting ribs.

In Figure 15, 6O designates a blank of general arcuate forin although the upper sides 51 are cut to flare slightly to the upper edge. Between these portions of this and the rest of the edges which flare in the other direction are indentations or notches 62 and in the center of the blank is a perforation 63 substantially in arcuate alignment with the indentations or notches 62. 64; designates a slot cut vertically in this blank but terminating at short oil the lower edge of the blank.

On one of the upper edges 61 is a triangular projection 66 op 'iosite which in the other edge 61 is an indentation 67 of less angulilllb. than that oil the projection 66. dotted lines GS(38 designate portions ot' this blank which are to be pinched together to term short outwardlyprojecting ribs 70 in the finished shield. The lines 69 designate portions of the blank which are to be stamped. into corrugations which in the finished shield are designated by 71.

The firststep toward forming a shield from such a blank after it has been corrugated is illustrated in Figure 16 which shows portions of the blank bent into transverse curves 72 with an intermediate curved portion 73 connected with the parts '72 along lines at 7 1-. The outer edges oi the blank are also bent to form curved portions if 75 joinwl to the portions 72 along lines at 76.

The shield then finished by folding the blank thus formed around a. central axis as shown in Figures H 21. The upper end oi the shield thus iorined will be substantially circular as shown at'77 in lligure 18 with the short ribs 70 projecting therefrom. This upper portion of the shield will however llare outwardly toward the upper end of the shield and this form is provided ffOl the purpose of closely fitting the outer end oi the hole and oi tacilitatii'ig the insertion of a. belt or screw. The parts T l and 76 however are so arranged. that when the shield is conipli the will converge toward the lower end oil. the shield to make the interior thereof similar in cross-sections... term to an hour glass. that is, these parts will converge to restrict the bore of the shield in one of its transrerse dimensions. outer portions of the shield will substantially throughout its length, be cylindrical and of a. diameter corresponding with that oi. the hole in which the device is to be used. The part oi": the shield which is formed of the portion 73 will increase in cross-sectional dimension toward the lower end of the The.

The

shield and so will the opposite part of the shield which is formed of the parts 75-75. The slot 64:, when used, ill divide the part ot the shield formed by the portion 73 throughout the greater part of the length of the shield and. the opposite part formed by the portion 75 will be divided throughout the length of the shield.

W hen the blank is folded together to form the tubular shield, the projection 66 will register with the indentation 67 as shown in Figure 20 and will serve to hold the edges of the shield in alignment in such a manner as to maintain the corrugations 71 in helical alignment. These corrugations are provided for the purpose of forming the inner bore of the shield with the internal screw threads with whirh the threads of a bolt or screw may engage. It may be seen that the shield thus "formed has a central chamber which diminishes from a cylindrical. form at the upper end to that of the hour glass form shown in Figure 19 at the lower end. il hen the bolt is inserted this part of the shield will be spread apart by the threads of the bolt. The transverse length of the restricted part of the bore of this device is, however, substantially the same as that off the internal periphery of the shield at its upper end so that when the bolt is inserted the metal of this shield. will substantially surround the threads of the bolt. The completed shield also has two longitudinal chambers formed within the parts formed by the portion 73 and the portions 75-75. These chambers increase in size toward the lower end of the shield so that they provide an excess ot metal so that when the bolt is inserted it will be crowded between the inner surface of. this shield and the wall or the hole in which the shield is inserted to thus form a secure anchorage.

It is not necessary that the constriction of the bore of the device he was in hour glass term, for example, in Figure 22 the in order to show that I do not intend to limit myself to any specific form of con SbllM'tlOIl, and in fact, intend no limitations other than those imposed by the appended claims.

h at I claim is:

1. An expansion shield of sheet metal with parts 0% the metal folded together to form ribs of a plurality of l-l'llCliIlQSSBS, and folded 4 lflllLll a. tube having edges of the from one end to the other versely into a tube having edges of the metal blank to form longitudinally disposed ribs extci'iding from one end to the other thereoit.

3.."41 expansion shield of sheet metal with parts thereoi bent to form longitudinal indentations, and folded transversely into a tube having edges of the metal extending from one end to the other thereof.

it. An expansion shield of sheet metal with. parts thereof bent to form longitudinal tapered. indentations and folded around a longitudinal axis with edges. of the metal extending; from one end to the other of the shield. V

5. An expansion shield of sheet metal. with parts of the metal folded together to form ribs oil? a plurality of thicknesses and other parts bent to form indentations substantially parallel with said ribs, and folded transversely into a tube having edges of the metal extending from one end to the other thereof.

6. An expansion shield of sheet metal having a smaller transverse dimension near one end than at other parts thereof with parts of the ll'lltillfOlClQCl together to form tapered ribs of a plurality of thicknesses, and folded transversely into a tube having edges of the metal extending from one end to the other thereof.

7. An expansion. shield oi? sheet metal having a sni aller transverse dimension near one end than at other parts thereof. with parts ol the metal folded together to term tapered ribs ot a plurality ht thiclznesse other parts of the metal bent to form tapered indentations substantially parallel with said ribs, and folded transversely into a tube having edges of the metal extend- ;ing from one end to the other thereof.

8. The herein described method ot-inalr ing an expansion shield which consists oli cutting; out a sheet metal blank having flat inn; sides, making longitudinally disposed bends therein to bring said sides substantiallyparallel. and folding); said blank trruisversely into a tube. V

9. The herein described n'iethod of maltinn; an expansion shield which consists of cutting out a sheet metal blank l'l2tVll1 l'lZLl inn; sides, foldii'ig together parts or said and to bring said sides substantially parallel, and folding said blank transrer ly into a tube. i

10. The )rocess of inakiuo an ezcoansion shield which consists in making four sided undivided sheet metal blank having one side of len th equal. to the length of the shield. one end having a length approxinately equal to the circumference oi? the con pletcd shield and the opposite endheving a greater length, and "folding the blank transversely into a tube. with the outer portions the not of greatest diameter lying.

substantially in the same cylinder.

11. The herein described method or male ing an expansion shield which consists of cutting out a sheet metal blank. making longitudinally disposed bends therein, and folding said. blank trznisversely around a longitudinal axis.

12. The herein described method of malting an expansion shield which consists 0: cutting; out a sheet metal blank having flaring sides. making lon tudinall v disposed bends therein to bring said sides substantially parallel, and folding said blanl; transversely around a longitudinal axis.

13. The herein described method of Utahan expansion shield which consists of cutting; out a sheet metal blanlr,. folds therein to provide an exc ss oil: metal, and folding said blank around longituuinal axis. 7

a la. The herein described method olt-rnalrinean CXpilnSlOn' shield wl'iich consists of cutting out a sheet metal blank having flarmaking lon. itudinally disposed tl'ierein project from one side of All- :l hc herein desc in;- an expansion shield which consists of cutting out a sheet metal blank having flaring sides making longitudinally disposed bends therein to form tapered depressions which will pro ,t inwardly. into the finisl'icd tube, waiting; other longitudinally disposed bends therein to torn: tapered ribs which will proi t outwardly from the finished tube am. by said bends bring the sides of the blank into substantial parallelism and foldi o; said b. around a longitudinal axis.

In witness whereof, I have hereunto set my hand this Qs'lth da v of Marclnltllfi).

lanl: transversely I 

